I thought I knew what I was doing, but it seems maybe I'm mistaken. My problem is this.
For the sake of argument, let's say if I load up a perfect document file as a KDP Ebook ,should it read perfectly on any device without tinkering by the customer?
My experience is this. It is colour image heavy and reads perfectly well in landscape mode on the tablet tool on the previewer. However, the whole thing is grey scaled on the Kindle E-reader facility and there are large unwanted spaces on the iPhone option.
What am I missing? Or is this considered normal, leaving the customer to manipulate whatever device being used accordingly?
To help you to help me I should advise I have no problems with text only manuscripts and the print versions on Creatspace in text only and colour image documents come back exactly as written on physical proof copies.
It looks like I need to learn some more new tricks - or maybe not. If anyone has an answer, please keep it jargon free, short and simple and feed it to me like I was a newborn.

P.S. There does seem to be a problem with images. Where I would prefer to have them centred they are being aligned left. I don't really have a problem with this, but I would prefer them to be where I put them. It is an instruction manual.

Cynthia E. Gould wrote:
Some Kindle ereaders are black & gray only. iPhones often bork text and images around.
I'm afraid there will never be "perfect" formatting across all devices.

Thanks for the prompt reply Cynthia. I didn't appreciate that fact. It seems I and my customers will have to learn to live with the imperfect technology; pity that. I'll put a disclaimer in the book details page to that effect before reloading the revised manuscript.
Let's see what others have to say.
Thanks again.